It is important to find an aortic aneurysm in early stage. Imaging examinations can find the aortic aneurysm, however they are not used for screening because of high cost. On the other hand, pulse wave can be measured easily. The aim of this study is to propose an easy method to find the aortic aneurysm using pulse wave. The basic theory is based on the wave of reactance silencer. The relation between the pressure transfer function of pulse wave and the expansion of artery was formulated. The computer simulation model of whole human artery was constructed. The transmission loss of pulse wave is increased by increase of the inner radius of aortic aneurysm. The frequency interval of local minimum values of the transmission function is decreased by increase of the length of aortic aneurysm or decrease of the Young's modulus. The method to find the aortic aneurysm from the pressure transfer function between brachial and anterior tibial arteries was investigated theoretically. This method can be used for diagnosis of aortic aneurysm.
